Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1983-06-24
1985-08-20
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358284, H04N 140
Patent
active
045368031
ABSTRACT:
A method and apparatus for intensifying contrast during the recording of masters in electronic image processing wherein a master is scanned opto-electronically and an image signal is produced as well as two unsharp masking signals by scanning a first unsharp masking area and an enlarged second unsharp masking area around the current image point. Differential signals are generated from the image signal and each of the two unsharp masking signals and the two differential signals thus formed are mixed together in a selected ratio. The mixed signal is divided into positive and negative correction components which can be differently amplified and after comparison to threshold signals are combined to form a correction signal which has an effective width which depends on the mixing ratio. The mixing ratio may for example, be dependent on the gradient and/or the contrast of a master contour. The correction signal thus formed is then superimposed on the image signal so as to provide contrasted intensification and the contrast enhancement can be matched to the properties of the master by controlling the effective width of the correction signal.
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H. R. Schindler, "Optical Scanning of Continuous-Tone and Line Documents with Spacial Frequency Separation for Improved Data Handling and Compaction", IBM Technical Disclosure Bulletin vol. 20, No. 12, 5/78.
Britton Howard W.
Coles Edward L.
Dr. -Ing. Rudolf Hell GmbH
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